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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0223b0392478c9f5f5bbd40137c90a39439721690fb827d73e7a5ede735ca74c' 
  AND token = '1xIfqi0OgVbEMbp87884c/sQb91yk5TyhZWI/93jhyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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