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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf27068611291fde5221ad56a9b5a9a89ff10cc85ac8e1c0422c04d003fd362' 
  AND token = '+zlqd5dM4CfIJE71f9X7R5XswSpMG8AO1j2TO7ANqTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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