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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29f73d6fa6ba561165cbdd3f03a4654fd55e1d28411fce86487cd0ee5aeacdf' 
  AND token = '30Pc0GpspwBF7fgtXUpdGfyYTYg+3kzhlTn437pj0qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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