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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524533bb90b4bf8c239d83480318fb6b13af23b8bcd94ebbfeb2f5dff9b52d57' 
  AND token = 'L1qjvjrBlk9ROMWyFlfb53cuw+cLrJqdQZFKzt93zSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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