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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8338a61830f226f26f98b941e81a7430fcfae58b6d7b8d3cbf04e49b8d9a93' 
  AND token = 'V1j7F/YvZU6YFPMyS4EH0nNBLRlm756BS3MBL3BQyxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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