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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdb9e041eff730040f2239bd6bd6410203b52d7ae282c8dda09b4e3c6eb1af7' 
  AND token = 'dHihs9RZuxJw91A8GAmhsL5Ps5NmM9I0x1M/3UyyPes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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