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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0bbf26e31dc6697fe6885314aa8cd56db651aabadc23dd3c0f76bff7cce619' 
  AND token = 'AbYEOU8q9TQ4UQkfoRhGFk0OgFUIWESPCqlWKgLuZoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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