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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931a3674d5d26f57753ce824b099692466680a811f85c30a53e9153e0ffb60d8' 
  AND token = 'ECpx5VWH5sJZY6CMoXidJJ9/OvDWB6LsPj89Dvaad1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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