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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0d566f0d4b636ad29ea79b1197c10f6d118839d2a8bef4e3aeb182fb4eca76' 
  AND token = 'EJGduCC6EyijUgQhzBeZaTdcb8FYcYGyFm2Gjxrj2Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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