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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4b0e90ab4626cb5271b69066e11d08bba8a57168fc915db0f37de1e7e51efd' 
  AND token = 'Ko96umx1YLx6CNOVTzwVfj8Xg6AUEBJsvW2Makvt0Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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