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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ceced734d6b6e5898edb8c578a89f2f7f5f67d266ef2b1bf393138a3e0cb0d' 
  AND token = '3dxOX8jZOXzXDaxyAg8qb9y8BCHGMlpZ0If4dlnNzWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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