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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61073221e0e2af816ee60a128db3736b7c14b3215cd18bfc50a4b1776f8a5d8b' 
  AND token = 'EK7XYzi4QMTEN40sbqoT+RbkZSxSI9/MxzH7nWcvg4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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