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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f06e34324fb70d8aec363d8c8ccd0b3b7022e0865bc86a9b4f80900b78ef483' 
  AND token = 'Qh1Xln16YBgDWvi8I6JE+suCzTT5DkYufSBAj7In+EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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