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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c2da88e38e91db23431f78fd15ac4fa3df9559da1d4f8e3db3f72823410d70' 
  AND token = 'Wvwa+3lPAWObZCb1y12e2gZsj+R1bX2AsvJf0HAg3LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}