SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8965feaafd97ce2b865988886fd5e5f948cae3cc5d6a41ff5c599506f2e3917' 
  AND token = 'p9Dyz2Q5JuRruL3V/eFRgKiqBT0ksZnv+vVAfnwx41Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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