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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5127a8fa4f997b3d2f5edac8c6b376a0f20d8b4555c03b87b837cc32a2c9141d' 
  AND token = 'A82i81esMGmhYjON11tkvbE9Onm9u7s8MiULBmAh0Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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