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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e332ad1794f1dd92ed33e49df64c57823922eee7cc0674a849904f16a6e9570d' 
  AND token = 'lOUsH/GlLpxm/PxtRVbbVOisULfnJ79a9pWInFNmqkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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