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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32374507d3863c00f9e99872edd87a71f04ea4cc85ad7e050f20f1d1447c4ca5' 
  AND token = '6LdOmJ1C54FfX/TzzqXx3+JEKif4xYpp3m10C0KgcGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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