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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8c61fa43401c6025837016048a2ad1e9ac136f12426f3489521595c1829c68' 
  AND token = 'ulg5ImrLoCV4zCYW9EThz6Xh0Y/Kwb8VfGeo3TN8WcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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