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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919422233b38a1370938a67b4b404045e54c2c1b77adcbc67e7af87e7cbb1f62' 
  AND token = 'Cz9A1Uii2ws14Vir0TgapDkulFUEg4jsK9gjjpcDLHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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