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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e8f906bfbed9d4864e29dbe9251a2430e13299e2d2e4c811575d778016edc0' 
  AND token = 'OMcODEDBeBRgcb/xyxpSbFvM4fIfxlbmCU6LP9brVKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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