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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ceff17613422f6de51c57f864e6110345c111bb6b32a8f283d667f828d35b8b' 
  AND token = '8LDOgEHtPP/RZUDRm0FJZ7pIe8Fz4w42ptoyTqbRxlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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