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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e7d7dc9195833e74070571021f43149ee367f70a068ad22b8bc17f4637ae06' 
  AND token = '2/NYK9qeUAjk/T8ajO66uIgFMXVLG0k5FnHSRzSDtD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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