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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81db2dce11882025eac096128c01c047023099615cb73dfd763ad45196530629' 
  AND token = 'gUqcd0mNGvVBjsVAFD4hENs40J8eWNbp/dijJKmZJGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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