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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a221bc5476448fb9020d1eb66b0dcfa17a0f163ad9dc8c58282442d9111b5d' 
  AND token = '7OvGsz8JKs0FZAjGNKqFcjx5lohKUmo6WOqhy4DUtfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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