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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef2e015dd05f73cf2c68d9d6da2398ab09707e4178abed882fc77b8b6e20b93' 
  AND token = 'gdXpIQ89cvx7WoRqc9XDMssnhiJSfQASxAEpF5Ibp70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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