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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcd4ed6763822bd078cc248ebcddb5bb65f2646fb25ced7e62aac0d3a2ef847' 
  AND token = '6Bo1l7TE/tt3rOONeMPPqvEZz4tg5QZeEgq84UYeqQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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