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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e174321a4bf30241388525dbcd24fde2e506fb28ea54e44ae80741eb0db61b84' 
  AND token = 'oUOnMiuA44HI38firgFR+EfGsNL2APUOPWyx6PwjGWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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