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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd790da8a2c1fe784c1ae7b487ce54b2f772c0e9b5cd6208ae8239945c562cd7f' 
  AND token = 'Q6uiCywIzmHnOtC1j40IwiY7RJNE3JgOVCThPODwEb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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