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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420ace7f9bf80c46d10e47d5a280cd44f7194ceb088a8acdeddaadc9209dd16b' 
  AND token = '4FAP0xh30keMSKufFJ6a1t7k8hvRPs4N9lqUcxNpFk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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