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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f2c78c6f71a36a3249b5b8f3ab0d9aa2a38fbed39fb6eaa4e7dd70be829922' 
  AND token = 'q12EKickvzxPqmP7l0Av0ifrhJfWhH87NHEfuIY79uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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