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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fe8518ceb79426493fe6c8c4190f011d62e75fb99aff036e0cf646b03bcb9b' 
  AND token = 'Q/GHzRBlQ7ZWtDY46KgkMjyk4o5GmL37u9RG2BzlGko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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