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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655d0e6eb029dbdf27884bad2c79760822885e069e8037fa5bfa8fc9cb1ff7a8' 
  AND token = 'bCWcu7RO7e8XVJHM+icaHmdHdPdntNHc8h7sDO5qnMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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