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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1392f4b6f912ba4119080e5b4e3c7b3ab11e27ef0bed50f1db1c8b31d2500b44' 
  AND token = '/GbAiJR8jT1tBA+mgC2h+X+yC+7MOA1A7mRXWYYZS9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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