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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7670761e5fba25d7f5661fac80ff7261ac8b2ff0819efad35e93fc18077181d0' 
  AND token = 'rw8evr8AZrMn87/m9ReVbd2XWR6uh0lv12+WxzXT9Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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