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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8370dfc9e87abbf5c8ab6a5d7fcb7fd44c7cd8520a15109383d152b57b62fd25' 
  AND token = '91cLGPcE4GFNyf1QEk6dvFLqG/1aW/zqOc1+WH1LjXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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