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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f18438798a26c0bad8ec9ac412d7701463cbe6c650a01eb2438dce0144dc6f' 
  AND token = '7Igcvl5G3/W/VRn660oI1CwFN7RSU1k/fCkgWC0979E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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