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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff55efd4fbcd246590356d2210f2a6a3ddf045facd18b93a09a56605fe2c4cb' 
  AND token = 'rvuSWAAoCxVQH6BfEjAy5feY70NAE8fIq/kI8q//gps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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