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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb15d66d42d97dc84366aeef1c9f6fc32d7d1d9dea9302bb4ef33987ae40db17' 
  AND token = 'y2vOLCTFyclOVqaglIg9+Yb3L9rh7nuGTou78sqYS14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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