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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d0ba707bb69f4d3d77f709a87a032916ca12b6e1b4ed38ee367718af1f36d2' 
  AND token = 'Ki+imnW0Q8hJ2YDc2ijNvyaIbOyQfZXv6rGb8TZqobc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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