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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d411e1f856ea7423c847f9149e29cfa8fe3454150fa51bca7bc836af9e24fa' 
  AND token = 'HKD5jDGn10Y4gxVk04+oPMVDNfXQTXeHHYWQEStmp2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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