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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd847596fe17987965fd0fa0ef6641fc734ac628759b465b39e6a10193e2e00d0' 
  AND token = 'cHyjqTmA4JDEMAXx/Q591vIgRRuJPlXprShl1kYTwMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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