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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d53a27d38c9d840446bbf94fee50ad77b5a05d6368d73210f9b8e28a9e242b' 
  AND token = 'e2B/G2Av/4qqddoLDOmxpgO3D69gNZ6HXwK47qHQoWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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