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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1a88959edf20c90bdcf758af65d1516910dd863fa613e995becc7b542e332b' 
  AND token = 'mH56FVXQy361esPX1wzj2Eueg49wrpjZ8TWykpQMbpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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