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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542b6b2a6aacf335a4d7c2ea3446a1fc88be5395297ba99ec6f3f611b8fa3fb5' 
  AND token = 'rZX4LQAhh3wN+c3UWTPZ+IjtzD1jI6Cub4FS1ODTPpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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