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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7236530b508f232bd26434a38035ca71c1c9a100b6b34eea8bba0ca740bd27e' 
  AND token = '/F6svM+QBsVerupubtCmNCuVll1cP3/tZtWWpgMMbhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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