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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907b75f7102f91593bf560c26a0e18f98d96cd4467b29a40160247a10eaa074c' 
  AND token = '4cmY6BjlK1gNBLa2y66nD1Gd08X+P/zCDkodZp4sqWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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