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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b24ebbace4b6b5b50eebf6d8f02f52f5fad2987f77e3bce6d4eb6e52c1ce64' 
  AND token = 'RSkncMPtIg2fAIWnzH5kr2OOjEoQSHgan4HV1io2u2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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