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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fb23e5e38e251c7b68b6b12eed6bb5fca1a35e4f6743959d7db6ea8602fab1' 
  AND token = 'fUQnEf3Z26Gx9iEj0QeA2ZCpIbD1xW4bYZKHKnN1G4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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