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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc95c06bd12d04ba46a087def292f0e690cc6e0bee9f319133b0498790029db' 
  AND token = 'LLcwheJSv/fhIn1B130hUXrx7zfaLruq8XO34mbH29Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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