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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026e5eebc25bbc7cdf87a51d3da6c2b4d4a2c81a400ed5998b8d093a08ae4d32' 
  AND token = '5yk+n0DowjBis6bW4U56Z+tIQh/fNsz4h9iJ5zxlZyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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