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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9530d2810282d013e38adfa5053d3599430641ac04cd20e58b10934d5d1ba891' 
  AND token = '8jdI1ZzCbbd4JRd9mK0WyNgwUcFjinDdIGuGlqtakII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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