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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b93dec9b72a4f8293b961737a1ead77b8a54b3e46e4cf4ec1266a90f5e6cc21' 
  AND token = 'xGN+EooojdUnqFT1b/MfW68BcAxsQ4y+cqRwdW0grgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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