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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7e17b92d1b72e67878ad9de382f3cf9f5fe285e71042ce077f0aea90c9d573' 
  AND token = '1VYtrM0QsOM4/NVv6TvW73d5tBQ0tYi62aFgeRDpLRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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