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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547e30b65a2d20d20520a8b94345d5c94fc8510c67e8d85d4658a9f0dd40e6e2' 
  AND token = 'iN4KyuWLW2yNUXruhZfosJdQBzVZQBGzS0xV5kuehTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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