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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da760136a24771730b9f5e75b3bc8592c2a88add4ae5577025c6533a7dd625e7' 
  AND token = 'y2eD2wkpJbK/kEjEXeFBnNMbotVTQl9zt++CpttMsAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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