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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b7fad67b1248fbcf5ab020cf8c07829da12b9e9a67358575ba654b29f8d5b2' 
  AND token = 'nI5DisHulXMcDIF5B7Y6qmApWsF5O8p6GxRe0qv4aYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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