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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09123cd9406ae37101ef62d9755860732f8349557db4b1d93284e4bf2d057006' 
  AND token = '+mzXdLQY0+5dMmOtULLN1/9bZwUjUh0TCYJycpX3d9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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