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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9225dd496d557c7d314ab70cbac992cf17df07104ac57c6a560f2d848ad1d1' 
  AND token = '5kXeHC9azIPVb8HPPD/5snYNcBNKd7BRu/NVPa6pGIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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