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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd933c9e9edb9b3e96d7423e230db74264ca3247ab6152b0c8da2c4267ac68765' 
  AND token = 'Wv4r6KJgwIRuckVtOux2Hywbp2jSiOmttxz7uxboSgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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