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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9adea604ae4d97d1c397732f20ecae33af8fbc019600421946a9b5ee0777a61' 
  AND token = '+zM8gfpnGEtZZUxttb5+qdYGqD4FeHrtl+4PDlrsaIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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