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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a94de9669e6af55769f9dd13fd8a1a20ff20b6d781d75141f095d5c14071b5' 
  AND token = 'ZNBDWqpNp6iySv0ONjFXUvJUCYyoMU0ZFB6b+bOMoH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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