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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75739d5cb78cb44b5f504b19949b766199e8082e3edf20ba5c34ebb8131ca68e' 
  AND token = 'XAw0I7SC9wHS2y1bmnNtPusmM+ZDjOdCHrWyjjeVyK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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