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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d4a0e8cbb260e5052220e2b3ab492f7f0096cbc9b3b8b944862e7e4a1b0d00' 
  AND token = 'sSGNeauKp7eU7j1VtVWnC9oQ8iTS4LFnsAptx9M8P1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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