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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fca0d4a74ced888cde7f930b60b87ccbf0cfe34231fa40e2492b96194f7a51f' 
  AND token = 'jbMO15Nk8WbXltBtrnTIJLl88X1AYX+6Z0nf+Bnv02g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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