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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f383d3289f78f29e09ec665ad24d952a9f4613321e9d1a1c32aad48c7e250c' 
  AND token = '9R679noMeJNpCdmHSZqyTi4o9wKaVj4FvXhwBNqdBRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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